What are some of the bad design choices in a raid encounter only people who never raided or done an ultimate could come up with?

If non raiders were tasked with creating an ultimate encounter, here's some of my predictions as to how it would be like

1. DPS checks that are only possible theoretically
2. Excessive RNG to prevent addon usage (won't work)
3. Gimmicks as the main source of difficulty, i.e. things people will figure out the solution quickly
4. a "gotcha" mechanic at the end of phases designed to get you killed just to fuck with the player
5. playstation exaflares
6. Insanely difficult final phase
7. weapons that are extremely ugly
8. passive aggressive legend title name and achievement name